Nathan's research project while at Ithaca College resulted in the paper Figures and First Years: An Analysis of Calculus Students' Use of Figures in Technical Reports, which appeared in the recent issue of Numeracy. The paper is available at http://scholarcommons.usf.edu/numeracy/vol10/iss2/art10/.
https://www.ithaca.edu/intercom/article.php/20170809171329193